Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
SUBMARINE K-21
In the Soviet submarine fleet involved in the sea battles of the great Patriotic war were the submarines of the type "K", obtained from our sailors affectionate name - "Katyusha". It was...
KAYAK — UNDER THE ROOF
Lightweight foam Mat that tourists usually take to sleeping in a tent can serve as a roof of a canopy for kayaks, covering travelers from the hot sun or rain. The rug is hung on wire...
